Join Date: Feb 2001
Location: Rolla, MO
Bikes: Redline Monocog,Surly Crosscheck, Lemond Reno
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If the crankarms aren't loose, then I'd say bad bearing.
Here's what I do when I have a BB that knocks..
A) Check the crankarms..if that isn't it I go to B
B) Make sure the BB isn't loose..if that isn't it, I go to C
C) New BB
One other thing, my friend was having BB problems, and we tried A, B, and C. It turned out to be a loose rear quick release, it made me feel stupid!!